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Reports ternary expressions which can be replaced by an elvis expression.
<p><b>Example:</b></p>
<pre><code>
  def notNull(o, defaultValue) {
      o != null ? o : defaultValue
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  def notNull(o, defaultValue) {
      o ?: defaultValue
  }
</code></pre>
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